One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,14)(13,16)(17,18,23,27)(19,28,20,24)(21,31,29,25)(22,32,30,26)(2,5)(6,8)(9,11)(10,13)(12,16)(14,15)(17,19)(18,24)(20,23)(21,30)(22,29)(25,26)(27,28)(31,32) involution — undirected(10,14)(11,16)(17,20,30,21,23,19,22,29)(18,25,32,28,27,31,26,24)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(17,21,30,19,23,29,22,20)(18,24,32,25,27,28,26,31)(2,5)(6,8)(10,14)(13,15)(17,22,23,30)(18,26,27,32)(19,29,20,21)(24,25,28,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.